单项选择题

蔡永父母在共同遗嘱中表示，二人共有的某处房产由蔡永继承。蔡永父母去世前，该房由蔡永之姐蔡花借用，借用期未明确。2018年5月，蔡永父母先后去世，蔡永一直未办理该房屋所有权转移登记，也未要求蔡花腾退房屋。 2021年下半年，蔡永因结婚要求蔡花腾退，蔡花拒绝搬出。有关本案的下列说法中，正确的是（）。

A.蔡永因未办理房屋所有权转移登记，无权要求蔡花搬出
B.因诉讼时效期间届满，蔡永的房屋腾退请求不受法律保护
C.蔡永已于2018年5月取得房屋所有权，有权要求蔡花腾退
D.蔡永应当先办理所有权转移登记，凭其产权登记要求蔡花腾退

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单项选择题

（2017年真题）某油罐因油品泄漏导致下伏潜水含水层污染，在污染物迁移模型的边界条件划定中，积累油类污染物的潜水面应划定为（）。

A.定浓度边界
B.与大气连通的不确定边界
C.定浓度梯度成弥散通量边界
D.定浓度和浓度梯度或总通量边界

单项选择题

Global warming is causing more than 300,000 deaths and about$125 billion in economic losses each year,according to a report by the Global Humanitarian Forum,an organization led by Annan,the former United Nations secretary general.The report,to be released Friday,analyzed data and existing studies of health,disaster,population and economic trends.It found that human-influenced climate change was raising the global death rates from illnesses including malnutrition and heat-related health problems.But even before its release,the report drew criticism from some experts on climate and risk,who questioned its methods and conclusions.Along with the deaths,the report said that the lives of 325 million people,primarily in poor countries,were being seriously affected by climate change.It projected that the number would double by 2030.Roger Pielke Jr.,a political scientist at the University of Colorado,Boulder,who studies disaster trends,said the Forum's report was a methodological embarrassment because there was no way to distinguish deaths or economic losses related to human-driven global warming amid the much larger losses resulting from the growth in populations and economic development in vulnerable regions.Dr.Pielke said that“climate change is an important problem requiring our utmost attention.”But the report,he said, will harm the cause for action on both climate change and disasters because it is so deeply flawed. However,Soren Andreasen,a social scientist at Dalberg Global Development Partners who supervised the writing of the report,defended it,saying that it was clear that the numbers were rough estimates.He said the report was aimed at world leaders,who will meet in Copenhagen in December to negotiate a new international climate treaty.In a press release describing the report,Mr.Annan stressed the need for the negotiations to focus on increasing the flow of money from rich to poor regions to help reduce their vulnerability to climate hazards while still curbing the emissions of the heat-trapping gases.More than 90%of the human and economic losses from climate change are occurring in poor countries,according to the report.What does Kofi Annan say should be the focus of the Copenhagen conference?

A.Howrichandpoorregionscanshareresponsibilityincurbingglobalwarming
B.Howhumanandeconomiclossesfromclimatechangecanbereduced
C.Howemissionsofheat-trappinggasescanbereducedonaglobalscale
D.Howrichcountriescanbetterhelppoorregionsreduceclimatehazards